A method in a memory circuit for rapidly determining the location of a file includes (a) associating the file with a timestamp and a unique identifier index number when the file is stored or updated in the memory circuit, and storing in a look-up table in the memory circuit the associated timestamp and an address associated with where the file is stored; (b) receiving a search request that specifies a unique identifier index number of a file to be located; and (c) using exclusive-or (XOR) circuits or content addressable memory (CAM) circuits to compare the unique identifier index number in the search request with the unique identifier index number stored in the look-up table, and reporting, when a match is found between the unique identifier index number in the search request and the unique identifier index number stored in the look-up table, the timestamp and address associated with the match.